576 lines
17 KiB
Plaintext
576 lines
17 KiB
Plaintext
{
|
||
"cells": [
|
||
{
|
||
"cell_type": "markdown",
|
||
"metadata": {
|
||
"id": "NXTSugt6ieXh"
|
||
},
|
||
"source": [
|
||
"## 訓練 CBoW 模型\n",
|
||
"\n",
|
||
"此筆記本是 [AI for Beginners Curriculum](http://aka.ms/ai-beginners) 的一部分\n",
|
||
"\n",
|
||
"在這個例子中，我們將學習如何訓練 CBoW 語言模型，來獲取我們自己的 Word2Vec 嵌入空間。我們將使用 AG News 數據集作為文本來源。\n"
|
||
]
|
||
},
|
||
{
|
||
"cell_type": "code",
|
||
"source": [
|
||
"import torch\n",
|
||
"import torchtext\n",
|
||
"import os\n",
|
||
"import collections\n",
|
||
"import builtins\n",
|
||
"import random\n",
|
||
"import numpy as np"
|
||
],
|
||
"metadata": {
|
||
"id": "q-UiiJUKaxHj"
|
||
},
|
||
"execution_count": null,
|
||
"outputs": []
|
||
},
|
||
{
|
||
"cell_type": "code",
|
||
"source": [
|
||
"device = torch.device(\"cuda\" if torch.cuda.is_available() else \"cpu\")"
|
||
],
|
||
"metadata": {
|
||
"id": "TFbR8CZaTZ1q"
|
||
},
|
||
"execution_count": null,
|
||
"outputs": []
|
||
},
|
||
{
|
||
"cell_type": "markdown",
|
||
"source": [
|
||
"首先讓我們載入數據集並定義分詞器和詞彙表。我們將 `vocab_size` 設置為 5000 以稍微限制計算量。\n"
|
||
],
|
||
"metadata": {
|
||
"id": "HIwC7lI5T-ov"
|
||
}
|
||
},
|
||
{
|
||
"cell_type": "code",
|
||
"source": [
|
||
"def load_dataset(ngrams = 1, min_freq = 1, vocab_size = 5000 , lines_cnt = 500):\n",
|
||
" tokenizer = torchtext.data.utils.get_tokenizer('basic_english')\n",
|
||
" print(\"Loading dataset...\")\n",
|
||
" test_dataset, train_dataset = torchtext.datasets.AG_NEWS(root='./data')\n",
|
||
" train_dataset = list(train_dataset)\n",
|
||
" test_dataset = list(test_dataset)\n",
|
||
" classes = ['World', 'Sports', 'Business', 'Sci/Tech']\n",
|
||
" print('Building vocab...')\n",
|
||
" counter = collections.Counter()\n",
|
||
" for i, (_, line) in enumerate(train_dataset):\n",
|
||
" counter.update(torchtext.data.utils.ngrams_iterator(tokenizer(line),ngrams=ngrams))\n",
|
||
" if i == lines_cnt:\n",
|
||
" break\n",
|
||
" vocab = torchtext.vocab.Vocab(collections.Counter(dict(counter.most_common(vocab_size))), min_freq=min_freq)\n",
|
||
" return train_dataset, test_dataset, classes, vocab, tokenizer"
|
||
],
|
||
"metadata": {
|
||
"id": "wdZuygtgiuLG"
|
||
},
|
||
"execution_count": null,
|
||
"outputs": []
|
||
},
|
||
{
|
||
"cell_type": "code",
|
||
"source": [
|
||
"train_dataset, test_dataset, _, vocab, tokenizer = load_dataset()"
|
||
],
|
||
"metadata": {
|
||
"colab": {
|
||
"base_uri": "https://localhost:8080/"
|
||
},
|
||
"id": "4d1nU1gsivGu",
|
||
"outputId": "949fe272-ae0e-49f5-c373-6703458b3a74"
|
||
},
|
||
"execution_count": null,
|
||
"outputs": [
|
||
{
|
||
"output_type": "stream",
|
||
"name": "stdout",
|
||
"text": [
|
||
"Loading dataset...\n",
|
||
"Building vocab...\n"
|
||
]
|
||
}
|
||
]
|
||
},
|
||
{
|
||
"cell_type": "code",
|
||
"source": [
|
||
"def encode(x, vocabulary, tokenizer = tokenizer):\n",
|
||
" return [vocabulary[s] for s in tokenizer(x)]"
|
||
],
|
||
"metadata": {
|
||
"id": "1XDYNhG8ToFV"
|
||
},
|
||
"execution_count": null,
|
||
"outputs": []
|
||
},
|
||
{
|
||
"cell_type": "markdown",
|
||
"metadata": {
|
||
"id": "LIlQk6_PaHVY"
|
||
},
|
||
"source": [
|
||
"## CBoW 模型\n",
|
||
"\n",
|
||
"CBoW 學習根據 $2N$ 個相鄰的詞來預測一個詞。例如，當 $N=1$ 時，我們可以從句子 *I like to train networks* 中得到以下配對：(like, I)、(I, like)、(to, like)、(like, to)、(train, to)、(to, train)、(networks, train)、(train, networks)。在這裡，第一個詞是作為輸入的相鄰詞，第二個詞是我們要預測的詞。\n",
|
||
"\n",
|
||
"為了構建一個用來預測下一個詞的網絡，我們需要提供相鄰詞作為輸入，並獲得詞的編號作為輸出。CBoW 網絡的架構如下：\n",
|
||
"\n",
|
||
"* 輸入詞會通過嵌入層。這個嵌入層就是我們的 Word2Vec 嵌入，因此我們會將其單獨定義為 `embedder` 變量。在這個例子中，我們會使用嵌入大小為 30，儘管你可能想嘗試更高的維度（真實的 Word2Vec 通常是 300 維）。\n",
|
||
"* 嵌入向量接著會傳遞到一個線性層，該層將預測輸出詞。因此它有 `vocab_size` 個神經元。\n",
|
||
"\n",
|
||
"對於輸出，如果我們使用 `CrossEntropyLoss` 作為損失函數，我們也需要僅提供詞的編號作為期望結果，而不需要使用 one-hot 編碼。\n"
|
||
]
|
||
},
|
||
{
|
||
"cell_type": "code",
|
||
"source": [
|
||
"vocab_size = len(vocab)\n",
|
||
"\n",
|
||
"embedder = torch.nn.Embedding(num_embeddings = vocab_size, embedding_dim = 30)\n",
|
||
"model = torch.nn.Sequential(\n",
|
||
" embedder,\n",
|
||
" torch.nn.Linear(in_features = 30, out_features = vocab_size),\n",
|
||
")\n",
|
||
"\n",
|
||
"print(model)"
|
||
],
|
||
"metadata": {
|
||
"colab": {
|
||
"base_uri": "https://localhost:8080/"
|
||
},
|
||
"id": "akKTcKQKkfl2",
|
||
"outputId": "da687e3e-a8ec-4c1a-e456-ab8cd6ac7dad"
|
||
},
|
||
"execution_count": null,
|
||
"outputs": [
|
||
{
|
||
"output_type": "stream",
|
||
"name": "stdout",
|
||
"text": [
|
||
"Sequential(\n",
|
||
" (0): Embedding(5002, 30)\n",
|
||
" (1): Linear(in_features=30, out_features=5002, bias=True)\n",
|
||
")\n"
|
||
]
|
||
}
|
||
]
|
||
},
|
||
{
|
||
"cell_type": "markdown",
|
||
"metadata": {
|
||
"id": "Nud6jgGPaHVa"
|
||
},
|
||
"source": [
|
||
"## 準備訓練數據\n",
|
||
"\n",
|
||
"現在讓我們編寫主要函數，用於從文本中計算 CBoW 詞對。這個函數將允許我們指定窗口大小，並返回一組詞對——輸入詞和輸出詞。請注意，這個函數既可以用於詞，也可以用於向量/張量——這將使我們能夠在將文本傳遞給 `to_cbow` 函數之前對其進行編碼。\n"
|
||
]
|
||
},
|
||
{
|
||
"cell_type": "code",
|
||
"execution_count": null,
|
||
"metadata": {
|
||
"colab": {
|
||
"base_uri": "https://localhost:8080/"
|
||
},
|
||
"id": "x-dsXygOieXn",
|
||
"outputId": "c2218280-e540-40ba-9546-efe48d0d714f"
|
||
},
|
||
"outputs": [
|
||
{
|
||
"output_type": "stream",
|
||
"name": "stdout",
|
||
"text": [
|
||
"[['like', 'I'], ['to', 'I'], ['I', 'like'], ['to', 'like'], ['train', 'like'], ['I', 'to'], ['like', 'to'], ['train', 'to'], ['networks', 'to'], ['like', 'train'], ['to', 'train'], ['networks', 'train'], ['to', 'networks'], ['train', 'networks']]\n",
|
||
"[[232, 172], [5, 172], [172, 232], [5, 232], [0, 232], [172, 5], [232, 5], [0, 5], [1202, 5], [232, 0], [5, 0], [1202, 0], [5, 1202], [0, 1202]]\n"
|
||
]
|
||
}
|
||
],
|
||
"source": [
|
||
"def to_cbow(sent,window_size=2):\n",
|
||
" res = []\n",
|
||
" for i,x in enumerate(sent):\n",
|
||
" for j in range(max(0,i-window_size),min(i+window_size+1,len(sent))):\n",
|
||
" if i!=j:\n",
|
||
" res.append([sent[j],x])\n",
|
||
" return res\n",
|
||
"\n",
|
||
"print(to_cbow(['I','like','to','train','networks']))\n",
|
||
"print(to_cbow(encode('I like to train networks', vocab)))"
|
||
]
|
||
},
|
||
{
|
||
"cell_type": "markdown",
|
||
"metadata": {
|
||
"id": "XVaaDLjaaHVb"
|
||
},
|
||
"source": [
|
||
"讓我們準備訓練數據集。我們將瀏覽所有新聞，調用 `to_cbow` 來獲取單詞對列表，並將這些對添加到 `X` 和 `Y` 中。為了節省時間，我們只考慮前 10k 條新聞項目——如果你有更多時間等待，並希望獲得更好的嵌入，可以輕鬆移除這個限制 :)\n"
|
||
]
|
||
},
|
||
{
|
||
"cell_type": "code",
|
||
"execution_count": null,
|
||
"metadata": {
|
||
"id": "54b-Gd9TieXo"
|
||
},
|
||
"outputs": [],
|
||
"source": [
|
||
"X = []\n",
|
||
"Y = []\n",
|
||
"for i, x in zip(range(10000), train_dataset):\n",
|
||
" for w1, w2 in to_cbow(encode(x[1], vocab), window_size = 5):\n",
|
||
" X.append(w1)\n",
|
||
" Y.append(w2)\n",
|
||
"\n",
|
||
"X = torch.tensor(X)\n",
|
||
"Y = torch.tensor(Y)"
|
||
]
|
||
},
|
||
{
|
||
"cell_type": "markdown",
|
||
"source": [
|
||
"我們還會將該數據轉換為一個數據集，並創建數據加載器：\n"
|
||
],
|
||
"metadata": {
|
||
"id": "cwWy0PzXWhN5"
|
||
}
|
||
},
|
||
{
|
||
"cell_type": "code",
|
||
"source": [
|
||
"class SimpleIterableDataset(torch.utils.data.IterableDataset):\n",
|
||
" def __init__(self, X, Y):\n",
|
||
" super(SimpleIterableDataset).__init__()\n",
|
||
" self.data = []\n",
|
||
" for i in range(len(X)):\n",
|
||
" self.data.append( (Y[i], X[i]) )\n",
|
||
" random.shuffle(self.data)\n",
|
||
"\n",
|
||
" def __iter__(self):\n",
|
||
" return iter(self.data)"
|
||
],
|
||
"metadata": {
|
||
"id": "mfoAcGPFZU8p"
|
||
},
|
||
"execution_count": null,
|
||
"outputs": []
|
||
},
|
||
{
|
||
"cell_type": "markdown",
|
||
"metadata": {
|
||
"id": "e4NQ_-5waHVc"
|
||
},
|
||
"source": [
|
||
"我們還會將該數據轉換為一個數據集，並創建數據加載器：\n"
|
||
]
|
||
},
|
||
{
|
||
"cell_type": "code",
|
||
"execution_count": null,
|
||
"metadata": {
|
||
"id": "AbLUcojlieXo"
|
||
},
|
||
"outputs": [],
|
||
"source": [
|
||
"ds = SimpleIterableDataset(X, Y)\n",
|
||
"dl = torch.utils.data.DataLoader(ds, batch_size = 256)"
|
||
]
|
||
},
|
||
{
|
||
"cell_type": "markdown",
|
||
"metadata": {
|
||
"id": "pKQr7sXeaHVc"
|
||
},
|
||
"source": [
|
||
"現在讓我們進行實際訓練。我們將使用 `SGD` 優化器，並設定相當高的學習率。你也可以嘗試使用其他優化器，例如 `Adam`。我們將先訓練 10 個周期——如果你希望更低的損失，可以重新執行此單元格。\n"
|
||
]
|
||
},
|
||
{
|
||
"cell_type": "code",
|
||
"source": [
|
||
"def train_epoch(net, dataloader, lr = 0.01, optimizer = None, loss_fn = torch.nn.CrossEntropyLoss(), epochs = None, report_freq = 1):\n",
|
||
" optimizer = optimizer or torch.optim.Adam(net.parameters(), lr = lr)\n",
|
||
" loss_fn = loss_fn.to(device)\n",
|
||
" net.train()\n",
|
||
"\n",
|
||
" for i in range(epochs):\n",
|
||
" total_loss, j = 0, 0, \n",
|
||
" for labels, features in dataloader:\n",
|
||
" optimizer.zero_grad()\n",
|
||
" features, labels = features.to(device), labels.to(device)\n",
|
||
" out = net(features)\n",
|
||
" loss = loss_fn(out, labels)\n",
|
||
" loss.backward()\n",
|
||
" optimizer.step()\n",
|
||
" total_loss += loss\n",
|
||
" j += 1\n",
|
||
" if i % report_freq == 0:\n",
|
||
" print(f\"Epoch: {i+1}: loss={total_loss.item()/j}\")\n",
|
||
"\n",
|
||
" return total_loss.item()/j"
|
||
],
|
||
"metadata": {
|
||
"id": "HeeCYKr_KF1w"
|
||
},
|
||
"execution_count": null,
|
||
"outputs": []
|
||
},
|
||
{
|
||
"cell_type": "code",
|
||
"source": [
|
||
"train_epoch(net = model, dataloader = dl, optimizer = torch.optim.SGD(model.parameters(), lr = 0.1), loss_fn = torch.nn.CrossEntropyLoss(), epochs = 10)"
|
||
],
|
||
"metadata": {
|
||
"colab": {
|
||
"base_uri": "https://localhost:8080/"
|
||
},
|
||
"id": "KVgwGtDHgDlT",
|
||
"outputId": "2447833f-f0e3-4566-c33d-addbfe2f451d"
|
||
},
|
||
"execution_count": null,
|
||
"outputs": [
|
||
{
|
||
"output_type": "stream",
|
||
"name": "stdout",
|
||
"text": [
|
||
"Epoch: 1: loss=5.664632366860172\n",
|
||
"Epoch: 2: loss=5.632101973960962\n",
|
||
"Epoch: 3: loss=5.610399051405015\n",
|
||
"Epoch: 4: loss=5.594621561080262\n",
|
||
"Epoch: 5: loss=5.582538017415446\n",
|
||
"Epoch: 6: loss=5.572900234519603\n",
|
||
"Epoch: 7: loss=5.564951676341915\n",
|
||
"Epoch: 8: loss=5.558288112064614\n",
|
||
"Epoch: 9: loss=5.552576955031129\n",
|
||
"Epoch: 10: loss=5.547634165194347\n"
|
||
]
|
||
},
|
||
{
|
||
"output_type": "execute_result",
|
||
"data": {
|
||
"text/plain": [
|
||
"5.547634165194347"
|
||
]
|
||
},
|
||
"metadata": {},
|
||
"execution_count": 16
|
||
}
|
||
]
|
||
},
|
||
{
|
||
"cell_type": "markdown",
|
||
"metadata": {
|
||
"id": "W8u2qXZmaHVd"
|
||
},
|
||
"source": [
|
||
"## 嘗試使用 Word2Vec\n",
|
||
"\n",
|
||
"要使用 Word2Vec，我們先提取與詞彙表中所有單詞對應的向量：\n"
|
||
]
|
||
},
|
||
{
|
||
"cell_type": "code",
|
||
"execution_count": null,
|
||
"metadata": {
|
||
"id": "r8TatcXjkU_t"
|
||
},
|
||
"outputs": [],
|
||
"source": [
|
||
"vectors = torch.stack([embedder(torch.tensor(vocab[s])) for s in vocab.itos], 0)"
|
||
]
|
||
},
|
||
{
|
||
"cell_type": "markdown",
|
||
"metadata": {
|
||
"id": "3OcX21UOaHVd"
|
||
},
|
||
"source": [
|
||
"讓我們看看，例如，單詞 **Paris** 是如何被編碼成一個向量的：\n"
|
||
]
|
||
},
|
||
{
|
||
"cell_type": "code",
|
||
"execution_count": null,
|
||
"metadata": {
|
||
"colab": {
|
||
"base_uri": "https://localhost:8080/"
|
||
},
|
||
"id": "bz6tAeLzieXp",
|
||
"outputId": "5b20850e-4342-45e9-f840-cfac2b4d61d8"
|
||
},
|
||
"outputs": [
|
||
{
|
||
"output_type": "stream",
|
||
"name": "stdout",
|
||
"text": [
|
||
"tensor([-0.0915, 2.1224, -0.0281, -0.6819, 1.1219, 0.6458, -1.3704, -1.3314,\n",
|
||
" -1.1437, 0.4496, 0.2301, -0.3515, -0.8485, 1.0481, 0.4386, -0.8949,\n",
|
||
" 0.5644, 1.0939, -2.5096, 3.2949, -0.2601, -0.8640, 0.1421, -0.0804,\n",
|
||
" -0.5083, -1.0560, 0.9753, -0.5949, -1.6046, 0.5774],\n",
|
||
" grad_fn=<EmbeddingBackward>)\n"
|
||
]
|
||
}
|
||
],
|
||
"source": [
|
||
"paris_vec = embedder(torch.tensor(vocab['paris']))\n",
|
||
"print(paris_vec)"
|
||
]
|
||
},
|
||
{
|
||
"cell_type": "markdown",
|
||
"metadata": {
|
||
"id": "pHTJlaeYaHVd"
|
||
},
|
||
"source": [
|
||
"使用 Word2Vec 來尋找同義詞是很有趣的。以下函數將返回與給定輸入最接近的 `n` 個詞。為了找到它們，我們計算 $|w_i - v|$ 的範數，其中 $v$ 是與我們輸入詞對應的向量，而 $w_i$ 是詞彙表中第 $i$ 個詞的編碼。我們然後對數組進行排序，並使用 `argsort` 返回相應的索引，接著取列表的前 `n` 個元素，這些元素編碼了詞彙表中最接近詞的位置。\n"
|
||
]
|
||
},
|
||
{
|
||
"cell_type": "code",
|
||
"execution_count": null,
|
||
"metadata": {
|
||
"colab": {
|
||
"base_uri": "https://localhost:8080/"
|
||
},
|
||
"id": "NlZyi-_olFar",
|
||
"outputId": "b5dbb163-88c4-4d5a-eaf2-6751f700e98c"
|
||
},
|
||
"outputs": [
|
||
{
|
||
"output_type": "execute_result",
|
||
"data": {
|
||
"text/plain": [
|
||
"['microsoft', 'quoted', 'lp', 'rate', 'top']"
|
||
]
|
||
},
|
||
"metadata": {},
|
||
"execution_count": 56
|
||
}
|
||
],
|
||
"source": [
|
||
"def close_words(x, n = 5):\n",
|
||
" vec = embedder(torch.tensor(vocab[x]))\n",
|
||
" top5 = np.linalg.norm(vectors.detach().numpy() - vec.detach().numpy(), axis = 1).argsort()[:n]\n",
|
||
" return [ vocab.itos[x] for x in top5 ]\n",
|
||
"\n",
|
||
"close_words('microsoft')"
|
||
]
|
||
},
|
||
{
|
||
"cell_type": "code",
|
||
"execution_count": null,
|
||
"metadata": {
|
||
"colab": {
|
||
"base_uri": "https://localhost:8080/"
|
||
},
|
||
"id": "-dQq7xeAln0U",
|
||
"outputId": "66f768c3-c248-4bfd-ce4f-c8ffc6d0dd0d"
|
||
},
|
||
"outputs": [
|
||
{
|
||
"output_type": "execute_result",
|
||
"data": {
|
||
"text/plain": [
|
||
"['basketball', 'lot', 'sinai', 'states', 'healthdaynews']"
|
||
]
|
||
},
|
||
"metadata": {},
|
||
"execution_count": 51
|
||
}
|
||
],
|
||
"source": [
|
||
"close_words('basketball')"
|
||
]
|
||
},
|
||
{
|
||
"cell_type": "code",
|
||
"execution_count": null,
|
||
"metadata": {
|
||
"colab": {
|
||
"base_uri": "https://localhost:8080/"
|
||
},
|
||
"id": "fJXqK26b29sa",
|
||
"outputId": "78f0baba-ffd0-485a-dd87-0a12bedfd7fa"
|
||
},
|
||
"outputs": [
|
||
{
|
||
"output_type": "execute_result",
|
||
"data": {
|
||
"text/plain": [
|
||
"['funds', 'travel', 'sydney', 'japan', 'business']"
|
||
]
|
||
},
|
||
"metadata": {},
|
||
"execution_count": 77
|
||
}
|
||
],
|
||
"source": [
|
||
"close_words('funds')"
|
||
]
|
||
},
|
||
{
|
||
"cell_type": "markdown",
|
||
"metadata": {
|
||
"id": "My0VeTDd3Ji8"
|
||
},
|
||
"source": [
|
||
"## 重點\n",
|
||
"\n",
|
||
"透過使用像 CBoW 這樣的巧妙技術，我們可以訓練 Word2Vec 模型。你也可以嘗試訓練 skip-gram 模型，該模型是基於給定中心詞來預測鄰近詞，看看它的表現如何。\n"
|
||
]
|
||
},
|
||
{
|
||
"cell_type": "markdown",
|
||
"metadata": {},
|
||
"source": [
|
||
"\n---\n\n**免責聲明**： \n本文件已使用人工智能翻譯服務 [Co-op Translator](https://github.com/Azure/co-op-translator) 進行翻譯。儘管我們致力於提供準確的翻譯，但請注意，自動翻譯可能包含錯誤或不準確之處。原始語言的文件應被視為權威來源。對於重要信息，建議使用專業人工翻譯。我們對因使用此翻譯而引起的任何誤解或錯誤解釋不承擔責任。\n"
|
||
]
|
||
}
|
||
],
|
||
"metadata": {
|
||
"colab": {
|
||
"collapsed_sections": [],
|
||
"name": "CBoW-PyTorch.ipynb",
|
||
"provenance": []
|
||
},
|
||
"interpreter": {
|
||
"hash": "16af2a8bbb083ea23e5e41c7f5787656b2ce26968575d8763f2c4b17f9cd711f"
|
||
},
|
||
"kernelspec": {
|
||
"display_name": "Python 3.8.12 ('py38')",
|
||
"language": "python",
|
||
"name": "python3"
|
||
},
|
||
"language_info": {
|
||
"codemirror_mode": {
|
||
"name": "ipython",
|
||
"version": 3
|
||
},
|
||
"file_extension": ".py",
|
||
"mimetype": "text/x-python",
|
||
"name": "python",
|
||
"nbconvert_exporter": "python",
|
||
"pygments_lexer": "ipython3",
|
||
"version": "3.8.12"
|
||
},
|
||
"orig_nbformat": 4,
|
||
"gpuClass": "standard",
|
||
"coopTranslator": {
|
||
"original_hash": "36df28efe3fe40b6fb0a7fa48fe3ea82",
|
||
"translation_date": "2025-08-31T10:36:54+00:00",
|
||
"source_file": "lessons/5-NLP/15-LanguageModeling/CBoW-PyTorch.ipynb",
|
||
"language_code": "hk"
|
||
}
|
||
},
|
||
"nbformat": 4,
|
||
"nbformat_minor": 0
|
||
} |